255.3% is the change from 217 to 771
Calculation steps:
[( 771 - 217 ) ÷ 217] x 100 = 255.3%
Formula
Percentage change = [(771 - 217) / 217] x 100
Subtract the new number by the original number
771 - 217 = 554
554 ÷ 217 = 2.552995391705069
2.552995391705069 x 100 = 255.3%